Java Core Quiz

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Test Java core concepts.

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Jeni Alex

India

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Java Core Quiz


Java Core QuizVersión en línea Test Java core concepts. por Jeni Alex 1 Which of the below method puts thread to blocked? a start() b run() c exit() d sleep() e 2 Which statement about constructors is true? a A class can only have one constructor b Constructor has a return type c A constructor initializes a new object and has no return type. d A constructor is optional 3 Which collection is ordered and allows duplicates? a Map b List c Set d Queue 4 Which method removes a key from a Map? a put b remove c size d clear 5 What does join() do in multithreading? a Starts a thread b Creates a new thread pool c Waits for a thread to finish. d Schedules execution later 6 Which Java 8 feature enables functional-style operations on collections? a Streams b Generics c Promises d Collections 7 Which collection is unsorted and has no duplicates? a TreeSet b LinkedList c ArrayList d HashSet 8 Which Map implementation preserves insertion order? a TreeMap b HashMap c Hashtable d LinkedHashMap 9 Which access modifier allows visibility to subclasses? a Default (package-private) b Protected c Public d Private 10 What Java 8 feature allows adding method bodies to interfaces? a Default methods b Interface without any methods c Static methods d Abstract methods 11 What is the smallest prime number? a 3 b 0 c 2 d 1 12 Which planet is known as the Red Planet? a Mars b Venus c Saturn d Jupiter 13 In which continent is the Sahara Desert located? a Australia b Africa c Europe d Asia 14 What is H2O commonly known as? a Salt b Oxygen c Hydrogen peroxide d Water 15 Who wrote Romeo and Juliet? a Charles Dickens b Mark Twain c William Shakespeare d Jane Austen 16 What is the approximate speed of light in vacuum? a 1,000 km/s b 30,000 km/s c 299,792 km/s d 150,000 km/s 17 What is the largest planet in our solar system? a Earth b Saturn c Mars d Jupiter 18 Which gas do plants primarily absorb for photosynthesis? a Oxygen b Argon c Carbon dioxide d Nitrogen 19 What currency is used in Japan? a Peso b Yen c Dollar d Euro 20 Which ocean is the Pacific Ocean? a Pacific Ocean b Atlantic Ocean c Indian Ocean d Arctic Ocean

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Java Core Quiz

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Java Core QuizVersión en línea

por Jeni Alex

Which of the below method puts thread to blocked?

Which statement about constructors is true?

Which collection is ordered and allows duplicates?

Which method removes a key from a Map?

What does join() do in multithreading?

Which Java 8 feature enables functional-style operations on collections?

Which collection is unsorted and has no duplicates?

Which Map implementation preserves insertion order?

Which access modifier allows visibility to subclasses?

What Java 8 feature allows adding method bodies to interfaces?

What is the smallest prime number?

Which planet is known as the Red Planet?

In which continent is the Sahara Desert located?

What is H2O commonly known as?

Who wrote Romeo and Juliet?

What is the approximate speed of light in vacuum?

What is the largest planet in our solar system?

Which gas do plants primarily absorb for photosynthesis?

What currency is used in Japan?

Which ocean is the Pacific Ocean?